Rodenticidal compositions



Patented Aug. 25, 1953 OFFICE 2,650,186 RODENTICIDAL COMPOSITIONS Gerhard Hecht, Wuppertal-Vohwinkel, Hans Aktiengesellschaft, corporation of Germa No Drawing. i Serial *No,

3 Claims. 1 r a The present invention relates to new rodenticides and rodent to rodenticides and rodent baits containing, as

Application December Leverkusen, Germany, a

Switzerland December With 60 per cent of sulfuric acid instead of hydrochloric Example 2 A solution of 10 grams of sulfuryl amide in their application, Thus they are either badly 10 200 00. 0f concentrated hydrochloric acid iS added taken, are not sufliciently stable or too expcnto a solution of 63 grams of p r f m l hy sjve, It h f th b proposed t use in 200 cc of concentrated hydrochloric acid The game compounds, h as stryehnine for th crystalhne precipitate formed after a short time purpose This compound which has become is sucked off after 5 hours stirring and worked practically important shows, however, great disp as Stated in ple advantages e. g. it is badly taken on account A180 in s example the Concentrated y roof its bitter taste. Also the use of certain arochloric acid may be replac d by 60 p c t o matic diazo compounds has recently been sug- Sulfuric acid gested, wh1ch compounds me well taken by the Example 3 rodents and possess a sufficient toxicity 005 per cent of the poisonous compound is According to the present invention a condenwith talcum, flour or fine bran A sation product of sulfuryl amide [SO2(NH2)2] ture of this powder with a Suitable baiting and formaldehyde has now proved to be terial, e. g. mashed potatoes, in the ratio of 1:10, ticularly suited for combating rodents. This is excellently suited for combating rats compound corresponds to the empirical formula (C2H4O2.N2S)2, and has a decompos1t1on point Emmple 4 of c o d to the formula the From 6 per cent of methyl cellulose, a little molar ratio in WhlCh the reactants have condyestuff nd the balance water, a paste 15 made densed, is 1:2. This new condensation product t which 004 per t of t po sonous is obtained by reacting sulfuryl amide with pound is admixed By mixmg thls paste Wlth a formaldehyde 1 concentrated aqueous mineral suitable baiting material in the ratio of 1 10 or acid, preferably in hYdlOChlOllC acid or sulfuric by thinly spreading it on slices of white bread, acid A ady at r m temperature a finely fish-heads or the like, baits are obtained which ry talline c n ensa on pr u is rm 1n a when eaten by rats W111 with certainty kill these short time. The product is only slightly soluble rodent in water, alkalies and dilute acids, further 1n Example 5 alcohol, ether, benzene and hgroine, and moderately soluble in glacial acetic acid and acetone, per of h polsonous compound are it can be recrystallized e g from acetone Omughly mlXed with 10 per cent of flour; 20

The said condensation product is distinguished per Cent of fish-flour and about 70 per cent of 40 bra 'th urthe by a very high toxicity; the compound 1s more n are added f mlxmg 1 P of poisonous than Strychnme and, therefore, very t 15 mixture 15 stlrred with about 2 parts of water effective when used in rodenticides and rodent gg fig g ready for Whlch 1S sulted for baits In consequence of the high toxicity Of the a ng m E compound only small quantities of the poison xample 6 need to be added to the baits, so that the taste 00 parts of wheat are well stirred with a, mixof the baits will not be influenced thereby ture of:

The following examples illustrate the inven- 0.05 parts of the poison tion without, however, restricting it thereto: 0.2 parts of dyestufi 0.8 parts of water glass Emmple 1 4.0 parts of water 25 grams of a 30 per cent aqueous formalde- The wheat grains thereby become equally covhyde solution are added to a solution of 10 grams ered with a dyed poisonous layer. Wheat grains of sulfuryl amide in 400 cc. of concentrated hythus incrusted are well taken by mice, 1 t z drochloric acid. Already after a short time the wheat grains are enough for killing one mouse.

prises reacting one mol of sulfuryl amide with two mols of formaldehyde in an amount of a concentrated aqueous mineral acid substantially greater than the total amount of said reactants, and separating the crystalline precipitate formed from the solution.

2. A poison bait for rodents comprisingv a' nutrient material attractive to rodents and an efiective amount of a highly'toxic, crystalline, condensation product having a decomposition tained by the process defined in claim 1;

m} Number r 3. A process of killing rodents, which comprises feeding rodents a poison bait as defined V in claim 2. 'GERHARD I-IECHT. E

HANS HENECKA. MARIANNE MEISENHEIMER.

References Cited in the file of this patent FOREIGN PATENTS Country Date France Oct. 25, 1937 OTHER REFERENCES Paquin, Angewandte Chemie, volume A-60 15 point between 255 and 260 C. and being ob- 1' (1948)pageS 316 to Wood et aL, J.'Soc. Chem. Ind., volume 52,

' Pages 346-9 T (1933). 

1. A PROCESS FOR PREPARING A HIGHLY TOXIC, CRYSTALLINE, CONDENSATION PRODUCT HAVING THE EMPIRICAL FORMULA (C2H4O2N2S)2 AND A DECOMPOSITION POINT BETWEEN 255 AND 260* C., WHICH COMPRISES REACTING ONE MOL OF SULFURYL AMIDE WITH TWO MOLS OF FORMALDEHYDE IN AN AMOUNT OF A CONCENTRATED AQUEOUS MINERAL ACID SUBSTANTIALLY GREATER THAN THE TOTAL AMOUNT OF SAID REACTANTS, AND SEPARATING THE CRYSTALLINE PRECIPITATE FORMED FROM THE SOLUTION. 